Calling device



C. L-GOODRUM.

CALLING DEVICE.

- APPuc/nmu FILED SEPT. 14,1911.

- Patented Fb. 22,1921.

, /h van/0r: C/mr/es' L Good/um- UNITED STATESW PATENT OFFICE- CHARLES L. GOODRUM, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

To all whom it may cancer-n Be it known that I, CHARLES L. GoonRoM, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Calling Devices, of which the following is a full, clear, concise, and exact description.

' This invention relates to calling devices of the type employed in directively con;

trolled machine switching telephone systems and has for its object the provision of an improved form of calling device. I

A feature of this invention is the provision of means for varying the character of the trains of impulses transmitted to a telephone line by the operation of a calling dial of the ordinary type.

According to the above mentioned fea ture, either one of two trains of impulses may be transmitted in response to each actuation of the dial. The train of impulses transmitted depends upon the position of a key which in one position shunts a certainnumber of impulses, and which when in another position, opens this shunt to allow these impulses to be transmitted over the telephone line in addition to the number dialed. The result of this arrangement is that more than ten impulses may be sent in a train of impulses by an ordinary ten position dial.

In the preferred embodiment of the invention, as shown on the accompanying drawing in which the figure is a diagranr matic representation of a calling device and the circuit connection therefor, one key controlling ten impulses is shown. The calling device may be of the well known type such as is disclosed in Patent 1,161,854, issued November 30, 1 15 to O. F. Forsberg, with the exception that there are two impulse wheels 1 and 2 mounted upon the shaft 3, instead of only one impulse wheel as shown in the above mentioned patent.

Cooperating with the wheel 1, there is a roller 10 which is fastened to a contact spring 4 in such a manner that when the wheel 1 is rotated in a clockwise direction, the roller 10 will ride over the teeth of wheel 1 without breaking the contact between springs 1 and 5, but when the wheel is rotated in the opposite direction each tooth of the wheel 1 will cause the springs 4 and 5 to open. A roller 6 is in engaement with the CALLING DEVICE.

Specification of Letters Patent. Patented Feb. 22, 1921 Applicationfiled September 14, 1917. Serial No. 191,365.

wheel 2 in a similar manner and controls the contact springs 7 and 8.

Each wheel is provided I with 'ten teeth spaced about half its circumference, but these wheels are so mounted on the shaft 3 that when the shaft is moved from normal in a clockwise direction, all the teeth of wheel 2 will engage roller 6 before the first tooth wheel 1 engages the roller 10. A dial 11 is fastened to the shaft 3 and is actuated by means offingerholds 12 provided around half its periphery. These holds are arranged to correspond with the teeth on the wheel 1.

The contact springs 4, 5, 7 and 8 are conneoted in series with one side of a telephone line. Normally the springs 7 and 8 are shunted by means of springs 14 and 15. A key is attached to the impulse sender in any well-known manner and isarranged to open the contacts 14: and 15 when depressed. The key is held in its depressed position by a catch 17 until released by the dial reaching its normal position after being actuated, at which time a lug 18 on the circumference of the dial 11 engages a pivoted lever 19 which in turn engages the catch 17 and releases the key 16 which is returned to its normal position by a spring (not shown).

etus suppose that three impulses are to be sent. In this case the key 16 is not operated so that the user merely engages with his finger the finger hold 12 opposite the numher 3 and rotates the dial in a clockwise direction until a stationary stop 20 is reached. In responseto the actuation of the dial 11 the shaft 3 and the impulse wheels 1 and 2 are rotated in a clockwise direction. The rotation of the dial also causes the winding up of a motor spring 13 in a well-known manner.

During the forward rotation of the impulse wheels 1 and 2 the rollers 10 and 6 are moved away from the contact springs 4L and 7 when engaged by the teeth of the impulse wheels 1 and 2- respectively and therefore do not cause the opening and closing of the contact springs 1 and 5 and 7 and 8.

When the users finger engages the stop 20, the positions of the wheels are such that the roller 10 is between the third and fourth teeth of the wheel 1. When the user releases the dial 11, i. 6., removes his finger from the engaged finger hold, shaft 3 and the elements fastened thereto are rotated in a counter-clockwise direction by the spring 13. Impulse wheel 1 now vibrates the roller 10 so as to open and close the contact springs l and 5 three times. As soon as the first tooth of wheel 1 leaves the roller 10, the last tooth of wheel 2 engages the roller 6. During the remainder of the backward movement of the shaft 3, the roller 6 is vibrated so as to open the contact springs 7 and 8 ten times, but due to the short circuit about these springs through springs 1d and 15, these ten impulses are not sent out over the telephone line.

It will now be-obvious that if thirteen impulses are desired, all that is necessary is to press the key 16 and operate the dial just as if three impulses were to be sent out. In this case since springs 7 and 8 are not shortcircuited, just as soon as the wheel 1 has finished sending out three impulses, the wheel Qwill commence to send out ten impulses, making thirteen in all. By this arange ment any train of impulses from one to ten can be sent with an ordinary ten position dial when the key is not depressed; any train of impulses from eleven to twenty can be sent if the key is depressed.

TV hat is claimed is:

1. In a calling device, a dial, means responsive to the actuation of said dial for producing different series of like impulses, a key, and means responsive to the actuation of said key for increasing the number of impulses in each of said series.

In a calling device, two impulse wheels, one of said wheels arranged to produce different series of impulses, and a key for nullifying the impulses produced by one of said wheels.

3. In a calling device, a dial, two impulse the dial, and a key arranged for determining whether the impulses produced by the first mentioned wheel shall be effective.

4. In a calling device, a dial, two impulse wheels actuated in response to the operation of said dial, one of said wheels being arranged to produce a train of impulses before the other starts to produce impulses, and a key for determining whether the impulses produced by the last mentioned wheel shall be eflectiv 5. In a calling device, a dial, means for producing a series of impulses by the actuation of said dial, and a key for determining whether certain of the impulses shall be effective.

6. In a calling device,'a rotatable shaft, a dial and two impulse wheels secured thereto, said impulse wheels being arranged to produce a continuous series of impulses, and a key for determining whether thoseiinpulses produced by one of said wheels shall be effective.

7. In a calling device, a rotatable shaft carrying two impulse wheels, a dial secured to said shaft for actuating said impulse wheels, means including one of said wheels for producing different series of impulses in response to the angular displacement of said dial, means including the other of said wheels for producing and adding to said series of impulses another series of a definite number to form a continuous longer series, and means including a. key for nullifying the impulses produced by the last said wheel.

b. In a calling device, two impulse wheels, one of said'wheels arranged to produce different series of impulses, and a key for determining whether the impulses of the other wheel should be effective.

In witness whereof, I hereunto subscribe my name this 8th day of September, A. I). 1914.

CHAR-LES L; GOODRUM. 

